- Catalytic aromatization of 1,4-dihydropyridines by radical cation salt prompted aerobic oxidation
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Aromatization of Hantzch 1,4-dihydropyridines was achieved under radical cation salt induced conditions, in which triarylamine radical cation acts as an efficient catalyst to prompt the aerobic oxidation of 1,4-DHPs in a catalytic way.
- Jia, Xiaodong,Yu, Liangliang,Huo, Congde,Wang, Yaxin,Liu, Jing,Wang, Xicun
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- Dimethyl 2,6-dimethyl-4-(3-nitrophenyl)-pyridine-3,5-dicarboxylate, diethyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and diethyl 2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate
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The crystal structure of diethyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, C19H22N2O6 (FR7534), a member of the 1,4-dihydropyridine class of calcium blockers, and the crystal structures of diethyl 2,6-dimethyl-4-(3-nitrophenyl)-pryridine-3,5-dicarboxylate, C19H20N2O6, and dimethyl 2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate, C17H16N2O6, decomposition products of FR7534 and dimethyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, respectively, reveal that the decomposition products display conformational features associated with activity according to structure-activity relationship.
- Rowan,Holt
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Read Online
- TEMPO supported amine functionalized magnetic titania: a magnetically recyclable catalyst for the aerobic oxidative synthesis of heterocyclic compounds
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Abstract: The present protocol uncover a new strategy to synthesize highly efficient solid TEMPO based catalyst in which 4-oxo-TEMPO was covalently tethered to the surface of amine functionalized magnetic titania. The chemical nature and structure of the
- Sharma, Sukanya,Choudhary, Anu,Sharma, Shally,Shamim, Tahira,Paul, Satya
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- Superparamagnetic core-shell metal–organic framework Fe3O4@Ni-MOF as efficient catalyst for oxidation of 1,4-dihydropyridines using hydrogen peroxide
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A facile and efficient method was described for oxidation of some 3,5-diacyl or 3,5-diester 1,4-dihydropyridines using H2O2 in the presence of superparamagnetic core-shell metal–organic framework Fe3O4@Ni-MOF. The Fe3O4@Ni-MOF has been obtained by Step-by-Step method in which magnetic Fe3O4 magnetic nanoparticles were coated with Ni-MOF using a mercaptoacetic acid linker. The synthesized catalyst was characterized using thermogravimetric analysis, FT-IR spectroscopy, powder X-ray diffraction, field emission scanning electron microscopy and energy-dispersive X-ray analysis. The novel superparamagnetic core-shell metal–organic framework Fe3O4@Ni-MOF revealed high efficiency for oxidation of various 1,4-dihydropyridines using hydrogen peroxide. The Box–Behnken design matrix and the response surface method were applied to investigate the optimization of the reaction conditions. The conditions for optimal reaction yield and time were: amount of catalyst ≈17 mmol, temperature ≈78°C and amount of hydrogen peroxide ≈ 1 ml. A variety of 3,5-diacyl or 3,5-diester 1,4-dihydropyridines with different substituted functional groups have been converted to corresponding pyridines with good to excellent isolated yields using H2O2 and Fe3O4@Ni-MOF. The catalyst was reused up to five times for the oxidation of 1,4-dihydropyridines without a significant loss in catalytic activity. The short reaction times, simplicity of method, good to excellent yields and reusability of catalyst were some advantages of the proposed procedure.
- Janani, Marzieh,Senejani, Masumeh Abdoli,Isfahani, Tahereh Momeni
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- One-pot synthesis of 3-hydroxy-2-oxindole-pyridine hybrids via Hantzsch ester formation, oxidative aromatization and sp3 C–H functionalization using FeWO4 nanoparticles as recyclable heterogeneous catalyst
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Synthesis of poly-substituted 3-hydroxy-2-oxindole-pyridine hybrids is reported via sp3 C–H bond functionalization as key steps using FeWO4 nanoparticles as reusable heterogeneous catalyst. Formation of Hantzsch ester (DHP) followed by aromatization, and sp3 C–H bond functionalization was achieved using FeWO4 nanoparticles (20 mol%) at 80 °C. Temperature dependent reactivity was observed for mono aldol (at 80 °C) and bis aldol (at 120 °C) products. The catalyst was regenerated and reused up to 6 cycles without losing catalytic activity. The FeWO4 nanoparticles were also used for oxidative aromatization of different DHP derivatives and for the sp3 C–H functionalization of 2-methyl pyridine.
- Paplal, Banoth,Nagaraju, Sakkani,Sathish, Kota,Kashinath, Dhurke
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p. 110 - 115
(2017/10/16)
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- Hantzsch Reaction Starting Directly from Alcohols through a Tandem Oxidation Process
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A Br?nsted acidic ionic liquid, 3-(N,N-dimethyldodecylammonium) propanesulfonic acid hydrogen sulphate ([DDPA][HSO4]), has been successfully applied to catalyze sequential oxidation of aromatic alcohols with NaNO3 followed by their c
- Liu, Xiaobing,Liu, Bin
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- Benzyltrimethylammoniumfluoride Hydrate: An Efficient Catalyst for One-Pot Synthesis of Hantzsch 1,4-Dihydropyridines and Their Aromatization
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An efficient, cost-effective and simple protocol has been developed for the synthesis of Hantzsch 1,4-dihydropyridines and their oxidation into pyridines using benzyltrimethylammonium fluoride hydrate as an excellent catalyst under solvent-free condition. All of the products synthesized by this method are characterized by various spectroscopic methods (IR, 1H NMR, 13C NMR, and DEPT).
- Khaskel, Anamika,Barman, Pranjit
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p. 114 - 120
(2016/04/01)
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- Photoinduced Aromatization of Dihydropyridines
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The combination of tris(bipyridine)ruthenium(II)/visible light/air is found to be effective for the aromatization of many dihydropyridines. A low catalyst loading of just 0.02 mol% is required.
- Lu, Zheng,Yang, Yong-Qing,Li, Hong-Xia
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supporting information
p. 4221 - 4227
(2016/11/26)
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- A new oxidation system for the oxidation of Hantzsch-1,4-dihydropyridines and polyhydroquinoline derivatives under mild conditions
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A new oxidation system (Na2S2O4/TBHP) to prepare pyridine derivatives has been developed by the oxidation of 1,4-dihydropyridine derivatives and polyhydroquinoline derivatives in good to excellent yields. The procedures of the reaction were green, convenient, mild and easy work-up.
- Bai, Cui-Bing,Wang, Nai-Xing,Wang, Yan-Jing,Lan, Xing-Wang,Xing, Yalan,Wen, Jia-Long
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p. 100531 - 100534
(2015/12/05)
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- Application of silica vanadic acid [SiO2-VO(OH)2] as a heterogeneous and recyclable catalyst for oxidative aromatization of Hantzsch 1,4-dihydropyridines at room temperature
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A simple method for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridines is described using hydrogen peroxide as green oxidant and silica vanadic acid as catalyst in acetonitrile at room temperature. The catalyst can
- Safaiee, Maliheh,Zolfigol, Mohammad Ali,Tavasoli, Mahsa,Mokhlesi, Mohammad
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p. 1593 - 1597
(2015/01/16)
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- Oxidative aromatization of Hantzsch 1,4-dihydropyridines by cupric bromide under mild heterogeneous condition
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A mild heterogeneous oxidizing agent, cupric bromide has been utilized for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridine derivatives in excellent yields with the isolation of products by simple work-up procedur
- Saikh, Forid,De, Rimpa,Ghosh, Somnath
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supporting information
p. 6171 - 6174
(2014/12/10)
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- Triton-X-100 catalyzed synthesis of 1,4-dihydropyridines and their aromatization to pyridines and a new one pot synthesis of pyridines using visible light in aqueous media
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A realistic and convenient synthetic method has been developed for the facile synthesis of 1,4-dihydropyridine derivatives in the presence of the non-ionic surfactant Triton X-100, in an aqueous medium at room temperature. A greener method to synthesize pyridine derivatives has also been developed by the oxidation of 1,4-dihydropyridine derivatives with almost 100% yields and also in a one pot synthesis, employing an aldehyde, ethyl acetoacetate and ammonium acetate in an aqueous micellar medium by irradiation with potassium persulphate in the presence of visible light. The one pot protocol offered excellent yields of the targeted product in a very short period of time at room temperature and the non-ionic surfactant catalyst can be recovered very easily. We also observed that during the reaction there was the formation of micelles, or micelle-like colloidal aggregates, from the non-ionic surfactant and the reaction mixture in water, measured by dynamic light scattering and visualized through an optical microscope. The process is advantageous as ammonia is generated from an ammonium salt under absolutely neutral conditions and the product purification follows a group assistant purification chemistry process (GAP).
- Ghosh, Partha Pratim,Mukherjee, Prasun,Das, Asish R.
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p. 8220 - 8226
(2013/09/02)
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- An efficient transition-metal-chloride/sodium-nitrite/TEMPO catalytic system for aerobic oxidative aromatisation of Hantzsch 1,4-dihydropyridines
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A facile and efficient transition-metal-chloride/sodium-nitrite/TEMPO catalytic system for aerobic oxidative aromatisation of Hantzsch 1,4-dihydropyridines in high yields under mild conditions is described.
- Lou, Bin-Hui,Chen, Shu-Bin,Wang, Jian,Chen, Ying,Li, Jing-Hua
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p. 409 - 412
(2013/09/12)
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- Iodobenzene diacetate (IBD) catalyzed an quick oxidative aromatization of Hantzsch-1,4-dihydropyridines to pyridines under ultrasonic irradiation
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This project was undertaken to demonstrate the potential of iodobenzene diacetate for the oxidative aromatization of Hantzch-1,4-dihydropyridines under ultrasonic irradiation. All reactions were carried out under ultrasonic irradiation and results were co
- Kumar, Parvin,Kumar, Ashwani,Hussain, Khalid
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experimental part
p. 729 - 735
(2012/05/20)
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- N2O4 chemisorbed onto n-propylsilica kryptofix 21 and kriptofix 22 as two new functional polymers for the fast oxidation of urazoles and 1,4-dihydropyridines
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3-Chloropropylsilica was reacted with Kriptofix 21 or 22 in the presence of triethylamine to form N-propylsilica Kryptofix 21 and Kriptofix 22. Then N 2O4 was added to each of these polymers to chemisorb onto cavity of aza-crown ethers. These functionalized polymers were applied for the fast and simple oxidation of urazoles and 1,4-dihydropyridines, respectively.
- Chehardoli, Gholamabbas,Zolfigol, Mohammad Ali,Ghaemi, Ezat,Madrakian, Elaheh,Niknam, Khodabakhsh,Mallakpour, Shadpour
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experimental part
p. 596 - 599
(2012/09/07)
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- Simple and efficient synthesis of 2,6-dialkyl-3,5-dialkoxycarbonyl-4-(3- aryl-1-phenyl-pyrazol-4-yl)pyridines using TPAP/NMO as a catalyst under mild conditions
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Biologically important pyrazolylpyridines were synthesized in excellent yield by the oxidation of pyrazolyl 1,4-dihydropyridines (pyrazolyl 1,4-DHPs) using tetrapropylammonium perruthenate/N-methylmorpholine-N-oxide (TPAP/NMO) under mild conditions at 0 °C.
- Murugan,Ramamoorthy,Sundarrajan,Ramakrishna
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p. 2998 - 3002
(2011/05/04)
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- One-pot synthesis of hantzsch dihydropyridine catalyzed by ionic liquid (BmimOAc) and the oxidative aromatization of dihydropyridine using FeCl 3·6H2O
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A series of 1,4-dihydropyridines were synthesized in one pot synthesis with the yield of 80-93 % using ionic liquid [bmim]OAc as catalyst and DMF as solvent. The ionic liquid could be repeatedly utilized 5 times with no decrease of the yield. The aromatization of these dihydropyridines (4a, 4b, 4d, 4f, 4h and 4i) were executed by the action of iron chloride and the post-processing was simplified using ethanol instead of water in dissolving dihydropyridines.
- Liu, Ruidong,Zhang, Jian
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p. 1743 - 1746
(2011/12/22)
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- NaI readily mediated oxidative aromatization of hantzsch 1,4-dihydropyridines with hydrogen peroxide at room temperature: A green procedure
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The oxidative conversion of 1,4-dihydropyridines to give the corresponding pyridine derivatives in excellent yields was easily effected using the catalytic amount of NaI in combination with H2O2 (30%) as a green external oxidant. The
- Shahabi,Amrollahi,Jafari
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experimental part
p. 1052 - 1057
(2012/02/04)
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- Oxidative aromatization of hantzsch 1,4-dihydropyridines by H 2O2/V2o5 at room temperature
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A mild and highly efficient synthetic method was developed for the aromatization of 1,4-dihydropyridines employing H2O2 and 5mol% of V2O5. The reactions were carried out in CH 3CN to give pyridine compounds in excellent yields. Copyright Taylor & Francis Group, LLC.
- Su, Jinlong,Zhang, Cai,Lin, Dan,Duan, Yiqin,Fu, Xiangkai,Mu, Ruizhu
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experimental part
p. 595 - 600
(2010/04/24)
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- An expeditious oxidative aromatization of hantzsch 1,4-dihydropyridines to pyridines using cetyltrimethylammonium peroxodisulfate: A phase transferring oxidant
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A new approach to the use of potassium peroxodisulphate as an oxidizing reagent is proposed and applied to the case of oxidative aromatization of 1, 4-dihydropyridines with cetyltrimethylammonium peroxodisulfate, a phase transfer oxidant. We demonstrate h
- Kumar, Parvin,Kumar, Ashwani
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experimental part
p. 2299 - 2303
(2010/11/16)
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- A novel, facile, simple and convenient oxidative aromatization of Hantzsch 1,4-dihydropyridines to pyridines using polymeric iodosobenzene with KBr
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An easy, safe, effective and handy method for oxidative aromatization of Hantzsch 1,4-dihydropyridines catalyzed by hypervalent iodine (iodosobenzene) and potassium bromide to corresponding pyridine derivatives in high-yields and within short span of time was described. Dealkylation in case of 4-n-alkyl substituted 1,4-dihydropyridines was not obtained.
- Kumar, Parvin
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experimental part
p. 1429 - 1433
(2011/02/23)
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- Catalytic effect of basic alumina in the dehydrogenation of 1,4-Dihydropyridines with tetrabutylammonium peroxydisulfate
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4-Alkyl- or 4-aryl-1, 4-dihydropyridine derivatives were oxidized to the pyridine derivatives by tetrabutylammonium peroxydisulfate (n-Bu 4N)2S2O8 (TBAPD) in combination with basic alumina in refluxing acetonitr
- Memarian, Hamid R.,Barati, Behjat
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experimental part
p. 1143 - 1147
(2011/01/09)
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- Biomimetic catalytic oxidation of hantsch 1,4-dihydropyridines using [Bis-(salicylaldehye)-4-methyl-1,2-phenylenediimine]-Mn(III) chloride/sodium periodate under mild conditions
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[Bis(salicylaldehye)-4-methyl-1,2-phenylenediimine]Mn(III) chloride [Mn(III)-BSMP] as biomimetic catalyst was synthesized and identified by spectral and analytical data. A variety of Hantzsch 1,4-dihyropyridines were subjected by a catalytic amount of thi
- Montazerozohori,Nasr-Esfahani,Joohari,Haghighat, Nasrin
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experimental part
p. 4249 - 4254
(2010/11/17)
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- Electron transfer-induced aromatization of 1,4-dihydropyridines
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A wide variety of 3,5-dicarboethoxy-1,4-dihydropyridines and 3,5-diacetyl-1,4-dihydropyridines are aromatized to the pyridine derivatives by 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) at room temperature and under microwave irradiation. An electron tra
- Memarian, Hamid R.,Ghazaie, Marieh,Mehneh, Somayeh Kakhki
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experimental part
p. 1187 - 1192
(2010/03/01)
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- Oxidative aromatization of 1,4-dihydropyridines and pyrazolines using HbA-H2O2: An efficient biomimetic catalyst system providing metabolites of drug candidates
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Human hemoglobin (HbA) efficiently catalyses the oxidative aromatization of 1,4-dihydropyridines (1,4-DHPs) and pyrazolines with hydrogen peroxide in phosphate buffer. The results of the study reveal that the rates of oxidative aromatization of 1,4-DHPs a
- Kumar, Atul,Maurya, Ram Awatar,Sharma, Siddharth
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scheme or table
p. 4432 - 4436
(2010/04/05)
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- Efficient oxidation of hantzsch 1,4-dihydropyridines with tetrabutylammonium peroxomonosulfate catalyzed by manganese(III) schiff base complexes: The effect of schiff base complex on the product selectivity
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Efficient and rapid oxidation of Hantzsch 1,4-dihydropyridine with tetrabutylammonium peroxomonosulfate (TBAO) is reported. The Mn(salophen)/monopersulfate catalytic system efficiently converts 1,4-dihydropyridines (DHPs) to their corresponding pyridine d
- Nasr-Esfahani, Masoud,Moghadam, Majid,Valipour, Ghasem
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experimental part
p. 3867 - 3879
(2009/12/24)
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- Aromatization of Hantzsch 1,4-dihydropyridines in solventless system using Glycinium chlorochromate
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Glycinium chlorochromate (GCC) supported onto silica gel was used as an effective oxidizing agent for the aromatization of 1,4-dihydropyridines to corresponding pyridine.
- Hekmatshoar, Rahim,Rezaei, Akram,Haghighi, Masoumeh,Ojghaz, Azadeh Jafari,Sajadi, Sodeh
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experimental part
p. 40 - 42
(2010/04/05)
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- PEG-N2O4 system as an efficient reagent both for the rapid oxidation of urazoles and 1,4-dihydropyridines under nonaqueous conditions
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N2O4 was easily impregnated on polyethyleneglycol to give a stable reagent. Polyethyleneglycol-N2O4 (PEG-N 2O4) system was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones and also for the aromatization of 1,4-dihydropyridines into the corresponding pyridine derivatives under mild conditions at room temperature with good to excellent yields.
- Zolfigol, Mohammad Ali,Ghaemi, Ezat,Madrakian, Elaheh,Niknam, Khodabakhsh
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experimental part
p. 704 - 711
(2009/05/26)
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- Aromatization of 1,4-dihydropyridines using tetraethylammonium bromate as an oxidizing agent
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Quaternary ammonium bromate have been prepared from the corresponding bromide and used as a mild and efficient oxidizing agent for the aromatization of Hantzsch esters and related compounds to pyridine derivatives.
- Das, Pranab J.,Baruah, Akashi
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experimental part
p. 1568 - 1571
(2009/04/07)
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- A novel oxidation-ring-contraction of Hantzsch 1,4-dihydropyridines to polysubstituted furans
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A novel oxidation-ring-contraction reaction took place when 4-substituted Hantzsch 1,4-dihydropyridines were treated with Oxone. This reaction pattern provided a convenient method for the synthesis of polysubstituted furans.
- Liu, Zhengang,Yu, Wei,Yang, Li,Liu, Zhong-Li
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p. 5321 - 5324
(2008/02/09)
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- KHSO4 supported onto bentonite, a versatile reagent for aromatization of Hantzsch 1,4-dihydropyridines
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Aromatization of Hantzsch 1,4-dihydropyridines was promoted by KHSO 4, a relatively green chemical, supported onto bentonite to yield the corresponding pyridine derivatives in excellent yields. The reaction was carried out under mild and conven
- Heravi, Majid M.,Bakhtiari, Khadijeh,Oskooie, Hossein A.
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p. 579 - 581
(2008/02/11)
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- 9-Phenyl-10-methylacridinium: A highly efficient and reusable organocatalyst for mild aromatization of 1,4-dihydropyridines by molecular oxygen
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(Chemical Equation Presented) The mild, efficient, and general aerobic aromatization of Hantzsch 1,4-dihydropyridines was realized at room temperature with 5 mol % of 9-phenyl-10-methylacridinium Perchlorate as the photocatalyst, which could be easily rec
- Fang, Xinqiang,Liu, You-Cheng,Li, Chaozhong
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p. 8608 - 8610
(2008/02/13)
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- Catalytic oxidation of 1,4-dihydropyridins by tetrabutylammonium periodate in the presence of manganese amino acid Schiff base
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The amino acid Schiff base manganese complex (Tryp-Mn); 1, was prepared with L-tryptophan, salicylaldehyde and Mn(OAc)2.4H2O in methanol. In the presence of 1, 1,4-dihydropyridines (1,4-DHPs) were oxidised by n-Bu4NIO
- Karimipour, Gholam Reza,Nasr-Esfahani, Masoud,Valipour, Ghasem
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p. 415 - 417
(2008/02/12)
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- Silica chromate as a novel oxidizing agent for the oxidation of 1,4-dihydropyridines
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Silica chromate easily converts 1,4-dihydropyridines to their corresponding pyridines in the presence of NaHSO4·H2O and wet SiO2 in dichloromethane at room temperature in good to excellent yields. Copyright Taylor & Francis Group, LLC.
- Zolfigol, Mohammad Ali,Salehi, Peyman,Ghorbani-Choghamarani, Arash,Safaiee, Maliheh,Shahamirian, Mozhgan
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p. 1817 - 1823
(2008/02/02)
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- A facile aromatisation of 1,4-dihydropyridines by ammonium nitrate in acetic acid
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The oxidation of 1,4-dihydropyridines to pyridines with ammonium nitrate as an oxidant in the presence of acetic acid proceeds in excellent yield.
- Awachat, Moreshwar M.,Shaikh, Ajam C.,Ganjave, Nitin V.,Chavan, Subhash P.,Shivakumar,Kalkote, Uttam R.
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p. 193 - 194
(2008/02/09)
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- A convenient and efficient protocol for oxidative aromatization of Hantzsch 1,4-dihydropyridines using benzyltriphenylphosphonium peroxymonosulfate under almost neutral reaction conditions
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Oxidative aromatization of 4-alkyl or aryl and heterocyclic-substituted derivatives of Hantzsch 1,4-dihydropyridines to the corresponding pyridine derivatives has been studied using benzyltriphenylphosphonium peroxymonosulfate as an oxidant in the presenc
- Adibi, Hadi,Hajipour, Abdol Reza
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p. 1008 - 1012
(2008/01/27)
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- BIFC and QFC promoted rapid and cleaner aromatization of 1,4-dihydropyridines under solvent-free condition
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(Chemical Equation Presented) This communication expresses aromatisation of 1,4-dihydropyridines to pyridine derivatives with the help of alumina supported benzimidazolium fluorochromate (BIFC) and quinolinium fluorochromate (QFC) as oxidants under solvent-free microwave irradiation. Moderate to excellent yield (80-98%) of pyridine derivatives were achieved by this methodology.
- Sivamurugan, Vajiravelu,Vinu, Ajayan,Suresh, Valiyaveettil,Palanichamy, Muthaiyahpillai,Murugesan, Velayutham
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p. 973 - 977
(2008/03/29)
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- Oxidative-aromatization of hantzsch ester 1,4-dihydropyridines by KBrO 3/Cocl2.6H2O under mild condition
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KBrO3/CoCl2.6H2O system was used as an effective oxidizing agent for the oxidation of 1,4-dihydropyridines to the corresponding pyridine derivatives in refluxing CH3CN. The products were obtained in high to exce
- Dilmaghani, Karim Akbari,Zeynizadeh, Behzad,Mirzaei, Mansoor
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p. 139 - 142
(2008/02/12)
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- Siver salts/ iodine monochloride as a new oxidation system for the oxidative aromatization of 1, 4-dihydropyridines
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Silver salts such as silver nitrate and silver oxide have been found to promote oxidative aromatization of various 1, 4-dihydropyridines to their corresponding pyridine derivatives by iodine monochloride under heterogeneous conditions in dichloromethane a
- Montazerozohori, Morteza,Karami, Bahador,Nasr-Esfahani, Masoud,Musavi, Sayed Alireza
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p. 289 - 294
(2008/03/13)
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- N,N′-ethylene-bis(benzoylacetoniminato) copper (II), Cu(C 22H22N2O2), a new reagent for aromatization of Hantzsch 1,4-dihydropyridines
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A variety of Hantzsch 1,4-dihydropyridines were oxidized to their corresponding pyridines in high yields in the presence of Cu(C 22H22N2O2) in refluxing acetic acid.
- Dehghanpour, Saeed,Heravi, Majid M.,Derikvand, Fatemeh
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p. 433 - 438
(2007/10/03)
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- Biomimetic aromatization of Hantzsch 1,4-dihydropyridines by S-S bonds under mild conditions
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For the first time Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridines by diphenyl disulfide in ionic liquid.
- Aliyan, Hamid,Fazaeli, Razieh,Moemeni, Ahmad Reza,Massah, Ahmad Reza,Naghash, Hamid Javaherian,Khosravi, Fattaneh
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p. 2027 - 2034
(2008/09/18)
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- Oxidative aromatization of Hantzsch 1,4-dihydropyridines in the presence of mixed-addenda vanadomolybdophosphate heteropolyacid, H6PMo9V3O40
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A variety of Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridines in high yields in the presence of H6PMo9V3O40, a Keggin type heteropolyacid, in refluxing acetic acid. The heteropolyacid w
- Heravi, Majid M.,Derikvand, Fatemeh,Hassan-Pour, Shahla,Bakhtiari, Khadijeh,Bamoharram, Fatemeh F.,Oskooie, Hossein A.
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p. 3305 - 3309
(2008/02/09)
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- Silica gel-supported bis(trimethylsilyl) chromate: Oxidation of 1,4-dihydropyridines to pyridines
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An efficient and convenient method for the oxidation of 1,4-dihydropyridines mediated by silica gel-supported bis(trimethylsilyl) chromate in refluxing CH2Cl2 is reported. Copyright Taylor & Francis LLC.
- Heravi, Majid M.,Derikvand, Fatemeh,Oskooie, Hossein A.,Shoar, Rahim Hekmat
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- Zeofen: A user friendly agent for oxidation of the Hantzsch 1, 4-dihydropyridines
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Hantzsch 1, 4-dihydropyridines (DHPs) were readily oxidised by zeofen (ferric nitrate and HZSM-5 zeolite) to the corresponding pyridines in good yields.
- Heravi, Majid M.,Derikvand, Fatemeh,Oskooie, Hossein A.,Hekmatshoar, Rahim
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p. 168 - 169
(2007/10/03)
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- Rapid and efficient oxidation of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by manganese (III) Schiff base complexes
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Rapid and efficient oxidation of Hantzsch 1,4-dihydropyridine with sodium periodate is reported. The Mn(III)-salophen/NaIO4 catalytic system converts 1,4-dihydropyridines to their corresponding pyridine derivatives at room temperature in a 1:1,
- Nasr-Esfahani, Masoud,Moghadam, Majid,Tangestaninejad, Shahram,Mirkhani, Valiollah,Momeni, Ahmad Reza
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p. 2720 - 2724
(2007/10/03)
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- Mild and efficient oxidation of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by a new polystyrene-bound Mn(TPP)Cl
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Mild and efficient oxidation of Hantzsch 1,4-dihydropyridines with sodium periodate catalyzed by Mn(TTP)Cl supported on polystyrene-bound imidazole is reported. This heterogeneous catalyst is of great stability and reusability in the oxidation of 1,4-dihy
- Moghadam, Majid,Nasr-Esfahani, Masoud,Tangestaninejad, Shahram,Mirkhani, Valiollah
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p. 2026 - 2030
(2007/10/03)
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- Aromatization of Hantzsch 1,4-dihydropyridines with urea-hydrogen peroxide/maleic anhydride
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A simple method for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridines is reported using urea-hydrogen peroxide/maleic anhydride in acetonitrile.
- Momeni, Ahmad R.,Aliyan, Hamid,Mombeini, Heidar,Massah, Ahmad R.,Naghash, Hamid J.
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p. 331 - 333
(2007/10/03)
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- Aromatization of 1,4-dihydropyridines in the presence of methanesulfonic acid/NaNO2/Wet SiO2 under both heterogeneous and solvent free conditions
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A combination of methanesulfonic acid and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the oxidation of 1,4-dihydropyridines to the corresponding pyridine derivatives under mild and heterogeneous condi
- Niknam, Khodabakhsh,Zolfigol, Mohammah Ali,Razavian, Seyed Mehdi,Mohammahpoor-Baltork, Iraj
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p. 199 - 202
(2007/10/03)
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- Aromatization of 1,4-dihydropyridines in the presence of toluenesulfonyl choloride/NaNO2/WET-SiO2 under microwave irradiation
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A combination of toluenesulfonyl chloride and sodium nitrite in the presence of wet SiO2 was used as an effective oxidizing agent for the aromatization of 1,4-dihydropyridines to the corresponding pyridine derivatives under microwave irradiatio
- Niknam, Khodabakhsh,Zolfigol, Mohammah Ali,Rabani, Farideh
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p. 183 - 186
(2007/10/03)
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